Straight-line mechanism



Feb. 24, 1931. s. DEAN STRAIGHT LINE MECHANISM Filed July 1, 1927 2 Sheets-Sheet 2 a 1.3,-

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. 0 47 BY 2 r 4a 20 LI ATTORNEY ametrically opposite position.

Patented F eb. 24', 1931 Mans-m...

STUART DEAN, 0F INDIANAPOLIS, INDIANA, ASSIGNOR TC DEAN BROTHERS cor/r PANY, 0F INDIANAPOLIS, INDIANA, A CORPORATION STRAIGHT-LINE HIE GHANIM Application filed J'u1y 1, 1927. Serial No. 202,894.

.his invention relates pumps.

The chief object of this invention is to secure substantially straight line movement of one or more piston rods thru a system of rocking parts without the use of linear guide or guides for a piston roe or rods.

The chief feature of the invention consists in the provision of a lever arm which is pivotally and slidably mounted and so actuated that its pivotal and sliding movement at the actuated portion is confined to a substanto a power head for tially straight line movement.

The full nature of the invention will be understood from the accompanying drawings and the following description and claim.

7 In the drawings Fig. 1 is a perspective view and substantially a side elevation of a power head for pumps; illustrating the parts in the uppermost position. Fig. 2 is a similar view of the main portion of the invention showi g the parts thereof in the lower-most or Fig. 3 a perspectiveview of the head and substantially an end view thereof. Fig. a top plan view. Fig. 5 is a view similar to F 1 and 2 with the parts shown in one of the intermediate or neutral positions. (5 is a view similar to Fig. 2 showing a modified form of the invention wherein the link-conlining member is replaced by an arcuate cam and groove. Fit 7 is a view similar to Fig. 6 and a reverse Iorm of the modified form. Fig. 8 is aview similar to Figs. 5 to 7 inclusive and of a modified form of the invention.

. In the drawings 10 indicates a base entendmg upwardly from which are a plurality of uprights 11 which support in superposed relation a frame member 12. Mounted upon the base 10 is a pump head or valve chest 13 having the discharge line 14 and secured to said base by the anchoring bolts 15. Supported by the chest are the heads 16 and 17. extendin g upwardly from which are the cylinders 13 and 19 respectively in which are mounted pistons not shown carried by the piston rods 20 and 21 respectively.

The frame 12 includes a pair of spaced depending ears 22 which pivotally support a fulcrum pin or shaft 23 which is apertured 7 axis the goose-neck 26. has an arcuate path as inas at 2 lto slidably support the extension 25 cossed and is adapted to contain hard grease for lubrication of the pin and arm connection, the pin being indicated by the numeral 30. The pins 30 of the bifurcated arm 27 of the goose-neck lever 26 have a substantial straight line and parallel movement as indicated by the dotted lines a and F).

The mechanism for causing the two pins 30 to have substantially parallel and straight line movement without the aid. of straight lineguides comprises a link 31 pivoted at 32 to the goose-neck lever and pivotally supported by the fulcrum pin or shaft 33 mounted in a pair of ears 3% dependim upon the frame 12. The centers of the fulcrum pin or shaft 23 and the pin or shaft 33 lie in a plane substantially ,iiarallel to the frame 12. The end of the lint: 31 is pivotally supported by shaft 33 and is substantially U-shaped and is positioned an e'ularly thereof at 35. This prevents said linlr from having any other movement except pivotal movement about the 33. The pivot between the link 31 and dicated by the dotted line 36. As the noose neck lever is tilted on its pivot 23, the tilting movement or deviation from the straight line by reason of the arcuate movement thereof is compensated for by the restraint imposed by the link 31 which travels an opposing arcuate path, the two paths being equal in effect so that the bifurcated end 27 rises and descends in a substantially straight line. To secure such straight line movement, the goose-neck moves in and out by reason of the slidable support of the extension 25 thereof in the neck deviated from the tangent to the-arc about the fulcrum 23 at the intersection with the center plane.

The means for tilting the goose-neck lever upon its fulcrum comprises a power shaft 40 suitably actuated, which may be by motor or otherwise, and mounting gear 41, said shaft being rotatably supported in the bearings 42 in the frame 12. Pinion 11 meshes with gear &3 mounted on the projecting end of shaft 44 rotatably mounted in a 'U-shape extenhead whereby rotational-movement ofthe gear,

is transmitted into oscillatory movement of the lever. The rod is suitably secured in hearings or ears 51 and 52 of the gooseneck shaped lever 26 and the reduced end 25 thereof extends as aforesaid thru the apertured fulcrum 23. As the pinion is rotated, the eccentric pin 46 is slowly revolved which reciprocates the combination crankarm and power head which, by sliding to and fro on the guide rod 50, causes rising and lowering movement of the goose-neck lever 26 about the pivot 23. However, such arcuate movement is modified by the link 31 which causes said goose-neck to slide to and fro upon or in the fulcrum sup port 23 in amount substantially equivalent to the arcuate deviation from the tangent. Thus the end of the lever 26 is caused to have substantially straight line movement, and thus straight line movement is obtained without the necessity of providing a straight line vhundred series. The frame 112 has the extension 22 rotatably supporting the pivot 23 which rotatably supports at 2 1 the reduced extension 25 of the goose-neck lever 126.

pivot 23 and'the sliding movement is confined by means ofa pin 133 supported in an extension 134 of the frame 112. The lever 126 has an enlarged portion 135 provided with an arcuate slide 132 which receives pin 133 and thus the attempt of lever 126 to deviate from the before-mentioned tangent plane is com- Lilli 23. In this form of the invention the pin is carried by the goose neck and said pin rises and falls in the arcuate' slot 232 formed in the extension an ofthe frame 212. The tendency of the goose neck lever 226 to depart from the tangent plane in the tilting thereof is prevented by the goose neck being slid to and fro an amount equal to said tendency so that straight line movement of the end of the lever obtains.

Tn 8 a modified form of the invention is illustrated, the modification being twofoid. Gooseneck lever 326'has a crank and roo connection with pin 3&6 or gear 13. This eliminates the cross head construction and in large sizes the elimination ofthis friction is a considerable in efficiency. Also instead of the sliding bearing extension, the ear 322 of frame 312 pivotally supports at 323 the link 32% pivotally supportingpin 325 rigid with @RLEHSTOH 350 of the gooseneck.

The invention claimed is: s V

In a mechanism of the character described the combination of a lever having a gooseneck extension at one end and pivotally and slidably supported at its opposite end and including a cross-head confining guide support intermediate the pivotal support and. the opposite end of the lever, and a confining link stationarily pivoted at one end and pivoted to the lever at the opposite end adjacent the cross-head support and securing substantialiy linear reciprocation of the goose-neck extension of the lever.

In witness whereof, I have hereunto affixed my signature.

' STUART DEAN.

pensated by the shape of the slot 132 and the sliding movement of the lever. occasioned by the fixed position of pin 133 in said slot.

In 7 the same result is obtained, that, 1s,;stra ghtline motion. but in ,this'form of 

